package chapter04.example16;
class Animal{
    public void shout(){
        System.out.println("喵喵...");
    }
}
//dog类
class Dog extends Animal {
    public void shout(){
        System.out.println("汪汪...");
    }
    public void eat(){
        System.out.println("吃骨头...");
    }
}
public class Example16 {
    public static void main(String[] args) {
        Animal an = new Dog();//此时发生了向上转型  子类->父类
        Dog dog = (Dog)an;//此时发生了向下转型
        dog.shout();
        dog.eat();
    }
}